Former President George W. Bush confided to his closest ex-aides that he fears Donald Trump's nomination could hasten the downfall of the Republican Party, according to a Politico story out Tuesday.

"I'm worried that I will be the last Republican President," Bush told former aides and advisers at an April reunion in Dallas.

The Bush family has chosen to remain on the sidelines of the GOP nominating contest after former Florida Gov. Jeb Bush left the race. Jeb Bush has said he won't vote for Trump, and neither George W. Bush nor his father, former President George H.W. Bush, are attending this week's convention.